FTPClient中retrieveFileStream的用法

工作需要使用了org.apache.commons.net.ftp.FTPClient来操作FTP,记录一下心得。

这个类封装的很完善,使用起来也很简单,只是在使用retrieveFileStream的时候碰到了一点小问题,就是不知道怎么完成传输状态,尝试发送abor指令也不行。在咨询了bianbian和查看了源代码之后看到这一段说明以后解决问题:

  • You must close the InputStream when you
    • finish reading from it. The InputStream itself will take care of
    • closing the parent data connection socket upon being closed. To
    • finalize the file transfer you must call
    • {@link #completePendingCommand completePendingCommand } and
    • check its return value to verify success.

代码如下:

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import org.apache.commons.net.ftp.FTPClient;
public class TestFTP {
public static void main(String[] args) {
try {
FTPClient ftp = new FTPClient();
// initialize ftp connection
/*
*
*/
String remotefile = "test.xml";
InputStream is = null;
is = ftp.retrieveFileStream(remotefile);
if (is != null) {
is.close();
}
if (!ftp.completePendingCommand()) {
ftp.logout();
ftp.disconnect();
}
// continue
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

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